Nails is the 18th episode of Round The Twist.
Linda falls for new boy in school, Andrew. When he suddenly stops coming to school, she visits the island where he lives. At first Andrew tries to get rid of her, but then reluctantly admits what he's been trying to hide the fact that he has extra sets of fingernails growing on his hands.
- Richard Moir as Tony Twist
- Ben Thomas as Pete Twist
- Joelene Crnogorac as Linda Twist
- Jeffrey Walker as Bronson Twist
- Robyn Gibbes as Fay James
- Bunney Brooke as Helen Rickards
- Mark Mitchell as Harold Gribble
- Jan Friedl as Cecilia Gribble
- Richard E. Young as James Gribble
- Nick Mitchell as Tiger Gleeson
- Drew Campbell as Rabbit
- Zeta Briggs as Fiona Richmond
- Esben Storm as Ralph Snapper
- Andrew Daddo as Ghost Matthew
- Neill Gladwin as Ghost Jeremiah
- Marzena Godecki as Beautiful Girl
- Eamonn Kelly as Andrew Shelford
- Peter Bensley as Mr. Shelford
- Cheryle Street as Mermaid
- Based on the short story of the same name from Unbearable!.